摘要
用原子力显微镜原位研究了碘与淀粉在纳米尺度上的共聚作用.研究发现,在经糊化的淀粉样品表面滴加碘碘化钾溶液会引起淀粉样品的共聚:从约1 nm厚的膜状结构转变为网状结构,表观高度由0.6 nm到5 nm不等.反应产物的细微结构显示,部分淀粉链之间聚合成有螺旋特征或有颗粒特征的微结构.碘液还可以引起由异淀粉酶水解形成的直链淀粉的共聚,它们之间发生反应后,直链状结构变为一种复杂的聚合结构.碘遇淀粉显蓝色的现象可能与它们作用后形成的共聚物的纳米结构有关.
The inclusion between starch and iodine was studied in situ on nanometer scale by atomic force microscopy in air. Adding iodine into gelatinized starch could induce the inclusion. The membrane-like structures with an apparent height about 1 nm were observed changing into netlike structures with an apparent height varied from 0.6nm to 5nm. Fine structures revealed that some iodine-starch complexes entangled into helices, and some of them further folded into superstructures. We also studied the inclusion phenomena by adding iodine solution onto amylose sampies, in which, the amylose was obtained by the hydrolysis of potato starch using isoamylase. The rod-like structurcs changed into superstructures with block features were relate to the formed special nanostructures. also observed. The dark-blue iodine-starch complex may
出处
《河南工业大学学报（自然科学版）》
CAS
北大核心
2006年第5期13-17,共5页
Journal of Henan University of Technology：Natural Science Edition
基金
国家自然科学基金资助项目(20672029)
